Kolkata Municipal Corporation
IRCON International
TATA VOLTAS
Regional Biofertilizer Development Centre (Govt. of India)
IIT Kharagpur Electronics Dept.
National Institute of Cholera & Enteric Diseases
Crystal Industrial Works:
- Mondal Precesion
- Hydrotech
- Corroganon India Pvt. Ltd.
- PWD/DWS/PHED TRIPURA
Bengal Paper Mills, Sahidul & Co./RKG & CO/Wet Co.